pic pretty much tells the story, one match head ping on the reverse dome and that's it! i have had a half a dozen of these and this and another were the best, ive seen two dozen and this is comparable with the best, easily vnm and hard to replace..odd grayish green colour that i wont call smoke as smoke is gray and this definiely isn't..one for the colour specialist and offered for a very reasonable three dollars.satisfaction absolutely guaranteed, and thanks for looking.THANKS JIM AND ALAN!